预张拉光纤布拉格光栅应变传递规律实验研究

发布时间：2018-06-30 08:20

本文选题：光栅 + 光纤布拉格光栅　；参考：《激光与光电子学进展》2016年11期

【摘要】：利用裸光纤布拉格光栅测量结构物表面应变,基于光纤层-胶结层-基体层的应变传递模型,从理论上分析了预张拉对应变传递率的影响,并通过实验进行了验证。利用预张拉光栅与未预张拉光栅同时测量了等强度梁正反两面的应变。实验中为排除黏贴长度及厚度的影响,采用LOCTITE点胶机控制滴胶量,得到应变随荷载变化的曲线,并与等强度梁理论应变值进行对比,得到应变传递率与荷载的关系曲线。结果表明,在测拉应变时,预张拉光栅的应变传递率高于未预张拉光栅的应变传递率,且两者都在96%以上;在测压应变时,预张拉光栅的应变传递率低于未预张拉光栅的应变传递率,且两者均在95%以上,与理论分析相符。这说明对测拉应变的实验,预张拉能提高应变传递率;而对测压应变的实验,预张拉会降低应变传递率。
[Abstract]:Based on the strain transfer model of fiber layer, cemented layer and matrix layer, the effect of pretension on the strain transfer rate is analyzed theoretically and verified by experiments by using bare fiber Bragg grating (FBG) to measure the strain on the surface of the structure. The strain on both sides of equal strength beam is measured simultaneously by using pretension grating and unpretension grating. In order to eliminate the influence of adhesive length and thickness, the strain variation curve with load was obtained by using LOCTITE spotting machine, and compared with the theoretical strain value of equal strength beam, the relation curve between strain transfer rate and load was obtained. The results show that the strain transfer rate of pretension gratings is higher than that of unpretensioned gratings, and both of them are above 96%. The strain transfer rate of pretension gratings is lower than that of unpretensioned gratings, and both of them are above 95%, which is consistent with the theoretical analysis. This shows that pretension can improve the strain transfer rate in the experiment of measuring tensile strain, while in the experiment of measuring compressive strain, pretension can reduce the strain transfer rate.
【作者单位】：中国人民解放军理工大学爆炸冲击防灾减灾国家重点实验室;
【基金】：国家973计划(2013CB036005) 江苏省基础研究计划(SBK2016021801)
【分类号】：TP212

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